What yoyo said, then reboot after moving the files to the trash. If you have any trouble moving them start up the computer with the Shift key down till you see Extensions Disabled on screen, and try again.

Nuc's link is full of good stuff. As for installing--if the application doesn't have any extensions that it installs, all you have to do is open the .sit file (that's probably what you'll get) and drag the app to wherever you want to keep it on your HD.

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